Escaping from a brutal customer, Adolf Malcart unexpectedly crosses paths with Belfegor, the fourth prince of Hell. Belfegor, eyeing him as a potential sacrifice for his father, steers Adolf towards an unfamiliar path. Frustrated by witnessing injustices go unpunished, Adolf devises a proposition for Belfegor. However, bargaining with a demon like Belfegor, who embodies treachery and darkness, often leads to unforeseen consequences...